Use the Formula for the Cosine of the Difference of Two

question 111

Multiple Choice

Use the Formula for the Cosine of the Difference of Two Angles
- $\cos \left( \frac { 5 \pi } { 12 } \right) \cos \left( \frac { \pi } { 4 } \right) + \sin \left( \frac { 5 \pi } { 12 } \right) \sin \left( \frac { \pi } { 4 } \right)$

• A) \(\cos \left( \frac { \pi } { 6 } \right)\)
• B) \(\cos \left( \frac { \pi } { 3 } \right)\)
• C) \(\cos \left( \frac { 2 \pi } { 3 } \right)\)
• D) \(\cos \left( \frac { 5 \pi } { 6 } \right)\) Find the exact value of the expression.

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